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iPF Noob
Possibly. You need all the derricks and stuff too. Basically anything that can be engineered should be.
Take the four nearest derricks top and bottom, plus the two in front of you. Use jeeps to get there quick (just dodge the guards) then simply defend the middle bit with the artillery and a sniper or two.
You don't need a massive army to hold out, plus making a massive army costs money off your target.